【正文】 1 屆畢業(yè)設(shè)計(jì)（論文） 15 mov r7,100 setb TR1 。 jmp main。 subb a,9 jnc shi。mov p2,7fh clr 。 lcall delay1。 d5: mov r0,0fFH。mov TH1,0feh mov TL1,0efh jnb 01h,no_bell xrl p1,01h。 mov 30h,0fh。 Behrouz Forouzan 著） 我們將信息編碼成可以傳輸?shù)母袷?，下一步就是探討傳輸過程了。 因?yàn)榻涌谶B接的兩個(gè)設(shè)備有可能不是一個(gè)廠家生產(chǎn)的， 所以必須規(guī)定接口的特性并建立標(biāo)準(zhǔn)。對于配線問題主要考慮的因素是數(shù)據(jù)流。盡管只有一種發(fā)送并行數(shù)據(jù)的方法，串行傳輸卻有兩個(gè)子類：同步方式和異步方式（參見圖 61）。這稱為并行傳輸。通常八根導(dǎo)數(shù)據(jù)傳輸 并行傳輸 串行傳輸 同步傳輸 異步傳輸 天津工程師范學(xué)院 2021 屆畢業(yè)設(shè)計(jì)（論文） 18 線被捆成一根電纜，兩端都有連接頭。因?yàn)槿?此昂貴，所以并行傳輸通常被限制在最長 25英尺的距離內(nèi)。 串行傳輸以兩種方式進(jìn)行：同步方式和異步方式。約定模式是基于將比特組成字節(jié)。因而，為了通知接收方有新的比特組到達(dá)，在每字節(jié)的開頭都要附加一個(gè)比特。利用以上的方法，每字節(jié)的大小至少增加到了 10個(gè)比特，其中有 8比特的信息在加上 2 個(gè)或更多的提示接收方的信號(hào)。在字節(jié)之間可以插入間隙。也就是說，一定程度上的同步還是存在的，但僅僅局限在一個(gè)字節(jié)的時(shí)間內(nèi)。當(dāng)檢測到停止位到達(dá)時(shí)，接受方在下一個(gè)起始位到達(dá)前忽略接收的所有信號(hào)。例如，一臺(tái)終端到計(jì)算機(jī)的連接很自然就是一種異步傳輸?shù)膽?yīng)用實(shí)例。也就是說，數(shù)據(jù)被當(dāng)作不簡短的 0、 1 比特流傳輸，而接收方來將比特流分割成重建信息所需的一個(gè)個(gè)字節(jié)。 同步傳輸?shù)膬?yōu)點(diǎn)是速度快。在數(shù)據(jù)通信中經(jīng)常涉及到四個(gè)基本功能單元：兩端各有一個(gè)DTE和一個(gè) DCE。天津工程師范學(xué)院 2021 屆畢業(yè)設(shè)計(jì)（論文） 20 在物理層，這可以是一臺(tái)終端、一臺(tái)小型計(jì)算機(jī)、計(jì)算機(jī)、打印機(jī)、傳真機(jī)或是任何產(chǎn)生和處理數(shù)據(jù)的設(shè)備。由幸或者說不幸的是，我們都不是頭腦 閱讀者。你的聲帶和嘴是 DCE，你朋友的耳朵也是 DCE。在物理層，一個(gè)數(shù)據(jù)電路終接 設(shè)備（ DCE）接收從數(shù)據(jù)終端設(shè)備（ DTE）中產(chǎn)生的數(shù)據(jù)，將她們轉(zhuǎn)換為相應(yīng)信號(hào)，然后將這些信號(hào)發(fā)送到傳輸鏈路上。為實(shí)現(xiàn)這一通信，發(fā)送和接收的 DCE設(shè)備必須采用一樣的編碼技術(shù)（例如，頻移鍵控（ FSK）編碼）。 通過網(wǎng)絡(luò)，能夠傳送和接收模擬或數(shù)字?jǐn)?shù)據(jù)的任何功能單元都叫數(shù)據(jù)電路終接設(shè)備（ DCE）。t charge you more than 35% of your pensation if you win the case. If you are thinking about signing up for a damagesbased agreement, you should make sure you39。s Premier League match at Chelsea on Sunday. I am going to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport. For me it39。s actions. CSKA said they were surprised and disappointed by Toure39?？傆X得自己自己似乎應(yīng)該去做點(diǎn)什么，或者寫點(diǎn)什么。t really grow up, it seems is not so important。 Originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, and time. 原來，這個(gè)世界上，對某個(gè)事件能產(chǎn)生化學(xué)反應(yīng)的，除了非做不可的堅(jiān)決，還有，時(shí)間。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時(shí)候是最后又打起了退堂鼓。 Those were broken into various shapes of stationery。突然想到那件藍(lán)格子襯衫；那些被折成各種各樣形狀的信紙；那段從街角深巷伊始的友誼；還有那場還沒有開始就宣告了終結(jié)的邂逅計(jì)劃 …… 那些年那些天的非做不可，終于和青春一樣，都將在我們的人生中謝幕。t. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters). cause there 天津工程師范學(xué)院 2021 屆畢業(yè)設(shè)計(jì)（論文） 24 。ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。 Have declared the end of the encounter that haven39。那些曾經(jīng)所謂的非做不可，只是青蔥年華里自己給自己注射的一支強(qiáng)心劑，或者說，是自以為是的精神寄托罷了。s time, your ideas are always special to clear. Want, want, line is clear, as if nothing could shake his. Also once seemed to be determined to do something, but more often is he backed out at last. Dislike his cowardice, finally found that there are a lot of love, there are a lot of miss, like shadow really have been doomed. Those who do, just green years oneself give oneself an arm injection, or is a selfrighteous spiritual. 一個(gè)人的時(shí)候，自己的想法總是特別地清晰。t want to give vent to out your inner voice can be in the high school children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already can39。 The end of our life, and can meet many things really do? 而窮盡我們的一生，又能遇到多少事情是真正地非做不可？ 天津工程師范學(xué)院 2021 屆畢業(yè)設(shè)計(jì)（論文） 22 During my childhood, think lucky money and new clothes are necessary for New Year, but as the advance of the age, will be more and more found that those things are optional。 May be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very messy, in my mind constantly. Always feel oneself should go to do something, or write something. Twenty years of life trajectory deeply shallow, suddenly feel something, do it. 一字開頭的年齡已經(jīng)到了尾聲。s 21 win. Michel Platini, president of European football39。s antiracism taskforce, is in London for the Football Association39。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You